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Abstract
The basic defects in lipid assimilation that account for steatorrhea are not numerous, and thus only a few laboratory tests are needed for a logical investigation of these defects. Lipid is normally assimilated in four distinct stages: lipolysis, micellarization, cellular and delivery. Any one of these may be defective and lead to steatorrhea. Tests useful in identifying the defective stage include the xylose absorption test, the Schilling test, and biopsy of the small intestine.